EP3761388B1 - Battery pack - Google Patents
Battery pack Download PDFInfo
- Publication number
- EP3761388B1 EP3761388B1 EP20165540.4A EP20165540A EP3761388B1 EP 3761388 B1 EP3761388 B1 EP 3761388B1 EP 20165540 A EP20165540 A EP 20165540A EP 3761388 B1 EP3761388 B1 EP 3761388B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- case
- drain hole
- reservoir
- battery pack
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001816 cooling Methods 0.000 claims description 62
- 239000007788 liquid Substances 0.000 claims description 40
- 238000004891 communication Methods 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 4
- 230000000712 assembly Effects 0.000 description 9
- 238000000429 assembly Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 230000005484 gravity Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
- H01M50/636—Closing or sealing filling ports, e.g. using lids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/691—Arrangements or processes for draining liquids from casings; Cleaning battery or cell casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present disclosure relates to the field of a battery, and in particular to a battery pack.
- the battery pack comprises a battery module, a case for mounting the battery module, and a cooling system for radiation of the battery module.
- the battery module is mounted inside the case.
- US5392873A discloses a structure for securing a plurality of batteries used for an electric vehicle.
- the battery securing structure includes an inner spacer member having a lower inner spacer member and an upper inner spacer member, each of which is made of a synthetic resin such as polypropylene.
- the lower inner spacer member has partition portions divided into separate compartments to fixedly dispose each battery in a compartment whereby all the batteries are in a state in which they have been separated from each other on all sides.
- the upper inner spacer member includes pressing portions for pressing and holding desired portions of the batteries, concave portions for defining spaces used for conductive wires and cooling, and partition portions divided into compartments to unmovably dispose the batteries in a state in which they have been spaced away from each other.
- the plurality of batteries can be reliably and firmly secured and fixed within a battery box.
- WO2010064255A1 discloses a battery casing for the battery is provided, wherein battery casing supports electrodes arranged in a desired manner and connected to electrode terminal, wherein battery casing comprises a top closing means and a bottom closing means, characterized in that the bottom closing means comprises a chamber formed by a top covering means and bottom covering means and side covering means, wherein the top covering means of bottom closing means is provided with an opening means for causing transfer of accumulated products from the electrolyte chamber to chamber of bottom closing means, and one of side covering means is provided with another opening means for causing removal of accumulated products from chamber of bottom closing means to the external environment.
- CN107845751A discloses a waterproof box comprising a box body, a box cover, a base plate, a plurality of supporting legs and a liquid drainage nozzle; the cushion plate is fixed on the bottom surface in the box body through the supporting legs; a liquid outlet hole is formed in the side surface of the box body; the liquid drainage nozzle is formed by a square box body and a wedged box body; the box body, the square box body and the wedged box body sequentially communicate with one another; a connection hole of the square box body and the wedged box body is provided with a valve used for sealing the hole; and a knob is connected to the valve.
- a lithium battery is placed on the cushion plate; when liquid leakage of the lithium battery occurs, leaked liquid flows into a box body space below the cushion plate through a leakage hole, and the lithium battery can be prevented from being soaked in the leaked liquid; and when being overmuch, the liquid in the box body can be drained through the liquid drainage nozzle.
- US9350000B2 discloses a battery pack including a drainage device provided at a bottom portion of the housing case.
- the drainage device includes a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case.
- the drainage device is disposed between two of the terminal members that are connected to electrodes of the battery cells.
- US4009322A discloses that on the inside of the cover for a storage battery from which liquid is to be drained when the battery is inverted and rocked from side to side upstanding ribs are disposed to concentrate and direct the liquid to the vent openings. Additional ribs may block the flow of liquid past the vent opening in one direction and, in covers where the vent openings are disposed in a recessed channel, a rib may be employed to concentrate and direct liquid over the shoulder formed by the recess when the battery is inverted.
- WO 2012/076808 discloses a sealed, high-voltage battery pack for a hybrid or electric vehicle, comprising a casing containing cells for the production, storage and release of electric energy, and a removable tank containing a moisture absorbing material.
- the invention is characterized in that it comprises means for maintaining the interior of the casing sealed when the removable tank is removed.
- US 2002/076604 discloses a charging element device comprising a positive electrode terminal and a negative electrode terminal which are located at one end of a cylindrical battery case having a positive electrode and a negative electrode equipped therein and which are respectively connected to the positive electrode and the negative electrode, with an electrolyte solution charging opening being formed at the other end of the battery case.
- the electrolyte solution charging opening is sealed by a plug having a safety valve, and the safety plug reduces an inner pressure of the battery case when the inner pressure is not less than a predetermined pressure.
- the inventors have found that: there might be water accumulated within the case, or there might be a leakage phenomenon in the cooling system inside the case in rainy or other wetted occasions. These conditions are likely to cause short-circuit between the positive and negative electrodes of the battery module.
- the present disclosure proposes a battery pack, for optimizing the structure of the battery pack.
- the embodiments of the present disclosure provide a battery pack, comprising:
- the case comprises:
- the battery pack further comprises:
- the reservoir portion is mounted below a wall of the case provided with the drain hole, and sealingly connected with the wall; wherein the reservoir portion and the wall enclose the reservoir cavity.
- the reservoir portion is provided with an inner concave portion recessed in a direction away from the case.
- the inner concave portion is located outside all of the drain holes and covers all of the drain holes.
- the battery pack further comprises: a protection portion mounted on one side of the reservoir portion away from the case.
- the protection portion has a hardness greater than that of the reservoir portion, and the protection portion entirely covers the reservoir portion.
- the second case comprises:
- a bottom of the case body is provided with an inner concave area recessed in a direction away from the first case, and the carrier is connected with an edge of the recessed area.
- the cooling system comprises:
- all the battery cells of the battery module are arranged along a length direction of the case, and a maximum lateral surface of each of the battery cells and the wall in which the drain hole of the case is located face towards each other.
- the battery pack has a case and a battery module disposed inside an accommodating cavity of the case.
- a battery module disposed inside an accommodating cavity of the case.
- a reservoir portion is provided below the battery module, and in communication with the accommodating cavity of the case via a drain hole, such that the liquid in the accommodating cavity may be discharged into the reservoir cavity via the drain hole.
- a coordinate system is established in Fig. 1 , and subsequent descriptions of the respective orientations of the battery pack are made based on the coordinate system.
- the X-axis is a length direction of the battery pack.
- the Y axis is perpendicular to the X axis within a horizontal plane, and the Y axis represents a width direction of the battery pack.
- the Z axis is perpendicular to a plane formed by the X axis and the Y axis, and the Z axis represents a height direction of the battery module.
- the terms “above” and “below” are both defined relative to the Z-axis direction.
- the length direction of the case 1 coincides with that of the battery pack
- the width direction of the case 1 coincides with that of the battery pack
- the height direction of the case 1 coincides with that of the battery pack.
- the azimuth or positional relations indicated by the terms “top”, “bottom”, “within”, “outside”, which are based on the azimuth or positional relations illustrated by the drawings, are only for facilitating description of the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred thereto has to present a particular azimuth, and be constructed and operated in a particular azimuth, so that it cannot be understood as limiting the protected content of the present disclosure.
- Fig. 1 shows a schematic partial perspective structural view of the battery pack, in which the case 1 is in an open state.
- Fig. 2 one lateral wall of the second case 14 of the case 1 described later is removed in Fig. 2 to clearly show the structure of the battery module 2 inside the case 1 as well as the positional relationship between the battery module 2 and the second case 14.
- the embodiments of the present disclosure provide a battery pack, which comprises a case 1 and a battery module 2.
- the case 1 comprises an accommodating cavity 11 and a drain hole 12 in communication with the accommodating cavity 11.
- the battery module 2 is mounted inside the accommodating cavity 11.
- a reservoir cavity 10 for storing a liquid is provided below the battery module 2, and in communication with the drain hole 12.
- the term "below” mentioned here is immediately below or obliquely below, so that the liquid inside the accommodating cavity 11 flows through the drain hole 12 into the reservoir cavity 10 under the effect of gravity.
- the reservoir cavity 10 is for example located inside the case, or the reservoir cavity 10 is outside the case 1, or part of the reservoir cavity 10 is inside the case and the other part of the reservoir cavity 10 is outside the case. Specifically, there are three positions for providing the reservoir cavity 10: the first is that the reservoir cavity 10 is completely located inside the case 1; the second is that the reservoir cavity 10 is completely located outside the case 1; the third is that the reservoir cavity 10 has one part located inside the case 1 and the other part located outside the case 1. The various implementations will be described specifically later.
- the battery pack is provided with a reservoir cavity 10, which is located below a gravity direction of the battery module 2.
- the accommodating cavity 11 When there is liquid accumulated within the accommodating cavity 11, the accumulated liquid flows downward under the effect of gravity, to the drain hole 12, and into the reservoir cavity 10 via the drain hole 12 for storage.
- the reservoir cavity 10 since the reservoir cavity 10 is disposed below the battery module 2, the short-circuit phenomenon of the battery module 2 caused by the fluid within the accommodating cavity 11 is reduced or even avoided, thereby improving the operational reliability of the battery pack.
- the above-described technical solution is not limited by a placing height of the battery module 2, and in the case of a low height of the battery module 2 and a low position of the electrode terminal thereof, the short-circuit risk of the battery module 2 is reduced, thereby improving the operational reliability of the battery pack.
- the case 1 comprises a first case 13 and a second case 14.
- the second case 14 and the first case 13 enclose an accommodating cavity 11, and the second case 14 is located below the first case 13.
- the drain hole 12 is provided in the second case 14.
- the first case 13 and the second case 14 are locked together to form the above-described accommodating cavity 11.
- the first case 13 and the second case 14 use other detachable connection means such as bolt connection.
- the case 1 is formed by a mosaic of two case halves, which on the one hand facilitates mounting, replacing, repairing and servicing various members within the accommodating cavity 11 of the case 1, and on the other hand also makes it easier to manufacture and machine the case 1.
- the case 1 has a regular structure, so that the battery pack is conveniently mounted to the vehicle.
- the case 1 is configured to mount the battery module 2.
- the case 1 and the battery module 2 are detachably connected therebetween, for example, a connecting frame is mounted on the inner wall of the case 1, and a connecting member is disposed on the battery module 2, such that the connecting frame and the connecting member are detachably connected by bolts or the like.
- the drain hole 12 described above is provided at the bottom of the second case 14.
- the fluid within the accommodating cavity 11 automatically flows out of the accommodating cavity 11 via the drain hole 12 under the effect of self-gravity, thereby effectuating automatic draining of the liquid accumulated within the accommodating cavity 11.
- the battery module 2 comprises a battery cell assembly 21 and a cooling system 22.
- the battery cell assembly 21 comprises a plurality of battery cells 210 arranged side by side.
- the plurality of battery cells 210 are electrically connected to each other.
- the cooling system 22 is configured to cool the battery cell assembly 21 of the battery module 2.
- the cooling system 22 is filled with a fluid for cooling. There might be a leakage phenomenon at the connection of various members of the cooling system 22.
- the drain hole 12 is configured to discharge the fluid leaked by the cooling system 22, so that there is seldom or even no liquid accumulated inside the case 1, thereby reducing or even eliminating the short-circuit risk of the battery pack.
- the battery module 2 comprises a plurality of battery cell assemblies 21, which are provided to be connected in series, in parallel or both for the electrical connection manner, so as to realize the electrical properties required for the battery pack.
- the battery cell 210 comprises a housing 211, an electrode assembly 212 disposed within the housing 211, a connecting member 213 disposed at an end of the electrode assembly 212, and a cover place 214 covering the connecting member 213 and the end of electrode assembly 212.
- the cover plate 214 is provided with an electrode terminal 215.
- the housing 211 is closed at one end and open at the other end.
- the cover plate 214 is disposed at an opening of the housing 211.
- the electrode assembly 212 is mounted to an interior of the housing 211 via the opening.
- the maximum lateral surface of the electrode assembly 212 and that of the housing 211 face towards each other, and the maximum lateral surface of the housing 211 serves as the maximum lateral surface A of the battery cell.
- the manufacturing manner of the electrode assembly 212 comprises a laminated manner and a wound manner.
- the laminated electrode assembly 212 is to tailor the positive electrode tab 216, the negative electrode tab 217, and the diaphragm 218 into a size having a specified dimension, and subsequently laminate the positive electrode tab 216, the diaphragm 218, and the negative electrode tab 217 into the electrode assembly 212.
- the wound electrode assembly 212 is to wind the positive electrode tab 216, the negative electrode tab 217, and the diaphragm 218 to form a shape.
- the maximum surface of the laminated electrode assembly 212 and the wound electrode assembly 212 is the surface having the largest expansion ratio.
- the battery cell 210 introduced later is laid flat. As shown in Figs. 1 and 2 , the placing manner effectively reduces the accumulated expansion of the battery cell assembly 21 and further reduces the accumulated expansion of the battery pack since the maximum expansion surface of the battery cell 210 is along the Z-axis direction, and the dimension of the battery module 2 along the Z-axis direction is smaller than the dimension along the X-axis or the Y-axis direction.
- a plurality of battery cells 210 are arranged along a length direction of the case 1, and a maximum lateral surface of each of the battery cells 210 and the wall 15 in which the drain hole 12 of the case 1 is located face towards each other.
- a plurality of battery cells 210 are arranged flat along the length direction X of the case 1. That is, the maximum lateral surface A of the battery cell 210 is substantially parallel to the length direction X of the case 1, and the maximum lateral surface A of the battery cell 210 and the wall 15 of the case 1 face towards each other.
- Fig. 1 two rows of battery cell assemblies 21 are provided along a width direction (i.e., the Y-axis direction) of the battery pack. In actual application, three rows or more are provided. In actual use, one or more layers of battery cell assemblies 21are provided in the height direction of the battery pack, that is, in the Z-axis direction in Fig. 1 .
- the placing manner in which the maximum lateral surface A of the battery cell 210 and the wall 15 of the case 1 face towards each other is also referred to be laid flat.
- the battery pack having such structure is more suitable for a vehicle having a relatively short space for mounting the battery pack.
- the bus bar of the battery cell 210 is also in a low position, and the electrode terminal 215 is relatively closer to the bottom of the case 1.
- the structure of the embodiments of the present disclosure is not employed, when there is leakage in the cooling system 22 inside the case 1 or liquid accumulated within the case 1, the battery cell 210 that is laid flat is more likely to be subjected to a short-circuited phenomenon.
- the above-described two problems can be favorably balanced, so that the battery pack may have a relatively short height to meet the vehicle installation requirements; and also the battery pack is less likely to be subjected to a short-circuited phenomenon inside, thereby improving the performance of the battery pack.
- the battery pack Since the battery pack has the reservoir portion 3 in communication with the accommodating cavity 11 via the drain hole 12, and the liquid accumulated within the accommodating cavity 11 readily flow out of the accommodating cavity 11 through the drain hole 12, thereby effectively reducing a possibility of a water accumulation phenomenon within the case 1, reducing and even avoiding a possibility of a short-circuit phenomenon in the battery module, and improving the performance and structure of the battery pack.
- each of the battery cells 210 of the battery module 2 is laid flat. Since the maximum expansion surface of each of the battery cells 210 comprised in the battery cell assembly 21 is along the Z-axis direction, there is less accumulated expansion of each of the battery cells 210, thereby optimizing the performance of the battery pack.
- the cooling system 22 is disposed outside the battery cell assembly 21, and configured to cool the battery cell assembly 21. Alternatively, the cooling system 22 cools the bottom surface of the battery cell assembly 21.
- the bottom surface of the battery cell assembly 21 refers to a surface of each of the battery cells 210 comprised in the battery cell assembly 21 facing the top surface provided with the electrode terminal 215.
- two rows of battery cell assemblies 21 share a set of cooling system 22.
- the top surfaces of the two rows of battery cell assemblies 21 provided with the electrode terminals 215 are opposite to each other, and the cooling system 22 is configured to simultaneously cool the bottom surfaces of the two rows of battery cells.
- the top surfaces of the two rows of battery cells provided with the electrode terminals 215 are away from each other.
- the bottom surfaces of each of the battery cells 210 of the two rows of battery cell assemblies 21 are arranged oppositely, with a gap between the two rows of battery cell assemblies 21, and the cooling plate 221 of the cooling system 22 is disposed at the gap to simultaneously cool the bottom surfaces of the two rows of battery cell assemblies 21.
- the cooling system 22 comprises a cooling plate 221 and a connecting pipe 222.
- the cooling plates 21 are internally provided with cooling flow passages (not shown in the drawings), and have a number of two or more.
- the cooling plates 221 have a number of two or more.
- the connecting pipe 222 is connected to the cooling flow passage to connect the respective cooling plates 221.
- the drain hole 12 is adjacent to a connection of the cooling plate 221 and the connecting pipe 222. Adjacent means that the drain hole 12 is relatively close to the connection between the cooling plate 221 and the connection pipe 222, so that the liquid leaking from the connection between the cooling plate 221 and the connection pipe 222 easily flow into the drain hole 12.
- a feeding pipe and a draining pipe may be additionally provided outside the case 1, and the cooling system 22 is in communication with both the feeding pipe and the draining pipe.
- the structure realizes the circulation of a coolant inside the cooling system 22, so that there is a favorable cooling effect of the battery pack.
- the cooling system 22 comprises two connecting pipes 222, which are respectively located on both sides of the battery module 2 in a length direction.
- One or more rows of drain holes 12 are provided below a connection position of each of the connecting pipes 222 and the cooling plate 221. If there is leakage at the connection between the connecting pipe 222 and the cooling plate 221, the drain hole 12 readily drain the accumulated liquid to ensure normal use of the battery module 2 inside the case 1.
- the cooling system 22 is disposed between the two end surfaces of the battery cell assembly 21, as shown in Fig. 1 , that is, one of the two cooling plates 221 of the cooling system 22 cools the bottom surface of one battery cell assembly 21, and the other cooling plate 221 cools the bottom surface of the other battery cell assembly 21.
- the above-described arrangement implements using one set of cooling system 22, and simultaneously cooling the two battery cell assemblies 21, thereby reducing the number of the cooling members and making a lightweight structure of the battery pack.
- the battery module 2 is integrally mounted to one of the walls of the case 1, which is referred to as a wall 15.
- the drain hole 12 is also disposed in the wall 15 of the case 1. Taking the direction shown in Fig. 1 as an example, the wall 15 is the bottom wall of the case 1. Further, the drain hole 12 is located below a gravity direction of the battery module 2.
- the drain hole 12 is disposed at the bottom of the case 1, so that the liquid directly flows towards the drain hole 12 under the effect of gravity and then into the reservoir cavity 10 when there is leakage in the cooling system 22 inside the case 1 described later.
- the flow path of the liquid is illustrated by the path M in Fig. 3 .
- the drain holes 12 are arranged in rows in the wall 15 of the case 1, and the drain holes 12 penetrate through the wall 15.
- the drain hole 12 is, for example, a circular hole, a trapezoidal hole, an irregular hole, or the like.
- the shape of the drain hole 12 is not limited, with a function of enabling the accumulated liquid to pass through and smoothly flow into the reservoir cavity 10.
- the drain hole 12 having a circular hole shape is used to facilitate the machining and manufacturing.
- the drain hole 12 having a trapezoidal hole is used, and the dimension at one end of the drain hole 12 in communication with the accommodating cavity 11 is greater than the dimension at the other end of the drain hole 12 in communication with the reservoir cavity 10.
- the structure effectively reduces a possibility of backflow of fluid within the reservoir cavity 10.
- the drain hole 12 having an irregular hole is used to implement randomly designing the structure, shape and dimension of the drain hole 12, so as to satisfy the personalized communicating requirements.
- the drain hole 12 is configured to allow liquid to flow unidirectionally from the drain hole 12 to the reservoir cavity 10.
- the drain hole 12 is provided with a direction regulating member that allows liquid to flow unidirectionally from the drain hole 12 to the reservoir portion 3.
- the drain hole has a dimension at one end greater than the dimension at the other end, or a film that prevents the backflow is provided at an end of the drain hole 12 to prevent the backflow.
- the dimension of the opening at one end of the drain hole 12 in communication with the accommodating cavity 11 is greater than the dimension of the opening at the other end in communication with the reservoir cavity 10.
- the end having a larger dimension is located upstream of the gravity direction, and the end having a smaller dimension is located downstream of the gravity direction.
- the fluid in the reservoir cavity 10 is also less likely to turn around into the accommodating cavity 11 during the use of the battery pack even if there are accidental conditions such as collision and impact, thereby reducing the short-circuit of the battery module 2 resulting from the backflow of the fluid in the reservoir cavity 10 to the accommodating cavity 11, optimizing the structure of the battery pack, and improving the performance of the battery pack.
- the reservoir cavity 10 may be located inside or outside the case 1, or partially inside the case 1 and partially outside the case 1.
- the battery pack further comprises a reservoir portion 3.
- the reservoir portion 3 is disposed outside the case 1.
- the reservoir portion 3 is separately provided with the reservoir cavity 10, or the reservoir portion 3 and the case 1 jointly form the reservoir cavity 10.
- the reservoir portion 3 is located outside the bottom of the case 1, and the reservoir portion 3 and the bottom wall of the case 1 are fixed together.
- the reservoir portion 3 and the case 1 are also sealingly connected therebetween, so that the reservoir cavity 10 communicates with the drain hole 12, and there is no fluid leakage from the connection between the reservoir portion 3 and the case 1.
- the manner of implementing sealingly connecting the reservoir portion 3 and the case 1 is for example in a way such that both of them are sealingly connected directly, or for example to implement a sealed connection by providing the sealing structures that are mated with each other.
- a sealing member is sandwiched between the reservoir portion 3 and the case 1, such that the reservoir portion 3 is sealingly connected to the case 1 by the sealing member.
- the reservoir portion 3 and the case 1 are also sealingly connected.
- One alternative manner is that the reservoir portion 3 is sealingly connected to the case 1 directly.
- Another manner is that a sealing member is sandwiched between the reservoir portion 3 and the case 1, such that the reservoir portion 3 is sealingly connected to the case 1 by the sealing member.
- the sealing member is, for example, a sealing ring or the like.
- the reservoir portion 3 is sealingly connected to the case 1, so that the liquid within the accommodating cavity 11 does not leak via the connection between the reservoir portion 3 and the case 1, thereby improving the performance of the battery pack.
- the reservoir portion 3 itself has a structure of a closed cavity which has an inflow port in communication with the drain hole 12.
- the closed cavity serves as the reservoir cavity 10.
- the reservoir portion 3 is a separate member, and separately forms the reservoir cavity 10.
- the reservoir portion 3 is sealingly fixed to the case 1, such that the reservoir cavity 10 communicates with the drain hole 12 to prevent leakage of liquid from the drain hole 12 to an area other than the reservoir cavity 10.
- the second implementation is that: the reservoir portion 3 and the case 1 jointly form the reservoir cavity 10.
- the reservoir portion 3 is mounted outside the wall 15 of the case 1 provided with the drain hole 12, and sealingly connected to the wall 15. Wherein, the reservoir portion 3 and the outside of the wall 15 enclose the reservoir cavity 10.
- the sealed connection manner of the reservoir portion 3 and the wall 15 is similar to the sealed connection method introduced above, and thus will not be described in detail here.
- the reservoir portion 3 is sealingly connected to the wall 15, so that the liquid within the accommodating cavity 11 does not leak via the connection between the reservoir portion 3 and the wall 15, thereby improving the performance of the battery pack.
- the reservoir portion 3 is provided with an inner concave portion 31, which encloses the reservoir cavity 10 with the wall 15.
- the inner concave portion 31 is for example plural, and a plurality of inner concave portions 31 jointly cover all of the drain holes 12.
- the inner concave portions 31 are located outside all of the drain holes 12. That is, the inner concave portions 31 completely cover all of the drain holes 12, so that the liquid within the drain hole 12 completely flows to the reservoir cavity 10.
- the inner concave portion 31 provided in one of the reservoir portions 3 is, for example, plural, and a plurality of inner concave portions 31 of the same reservoir portion 3 are in communication or not in communication.
- the material of the reservoir portion 3 comprises plastic.
- the plastic material which has a favorable deformation property, effectively absorb energy, and reduce a possibility of a sealing failure when subjected to a collision.
- the volume of the reservoir cavity 10 is greater than or equal to the capacity of the coolant in the cooling system 22. At the condition of a very serious leakage in the cooling system 22, the battery module 2 will not be soaked in the liquid as well, thereby enhancing the operational reliability of the battery pack
- the reservoir portion 3 further comprises a protection portion 4 mounted on one side of the reservoir portion 3 away from the outside surface.
- the protection portion 4 is, for example, a plate-like structure provided with an inner concave structure mated with the inner concave portion 31 of the reservoir portion 3, so as to completely wrap the outside of the reservoir portion 3, thereby reducing a possibility of failure of the reservoir portion 3 due to collision.
- the protection portion 4 is configured to protect the reservoir portion 3, to prevent that the reservoir portion 3 is deformed and damaged due to collision.
- the protection portion 4 has a strength higher than that of the reservoir portion 3.
- the protection portion 4 entirely covers the reservoir portion 3.
- the case 1 comprises a case body 141 and a carrier 142 disposed inside the case body 141.
- the carrier 142 divides the internal space of the case 1 into the accommodating cavity 11 and the reservoir cavity 10.
- the carrier 142 is provided with a drain hole 12, and the battery module 2 is mounted on the carrier 142.
- the carrier 142 is, for example, flat shaped.
- the carrier 142 is welded or bolted to the inner wall of the case 1. The above-described structure makes a more compact and lightweight structure of the battery pack.
- the functions of the accommodating cavity 11 and the reservoir cavity 10 are the same as those introduced above.
- the accommodating cavity 11 is configured to mount the battery module 2.
- the reservoir cavity 10 is configured to store fluid leaking from the accommodating cavity 11. Please refer to the above-described for other content.
- the bottom of the case 1 is provided with an inner concave area 16, and the carrier 142 is mounted at an edge of the inner concave area 16.
- the inner concave area 16 is a part of the case 1. The above-described arrangement is used to simplify the machining, and make a stable and reliable structure of the reservoir cavity 10.
- the exterior of the reservoir cavity 10 is provided with a protection portion 4 for covering the outer wall of the reservoir cavity 10.
- the protection portion 4 for example has a strength higher than that of the outer wall of the reservoir cavity 10.
- the protection portion 4 is configured to protect the outer wall of the reservoir cavity 10 to reduce a possibility of a leakage risk of the reservoir cavity 10 in the event of a collision or the like, and to ensure normal use of the battery pack.
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Battery Mounting, Suspending (AREA)
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Description
- The present disclosure relates to the field of a battery, and in particular to a battery pack.
- The battery pack comprises a battery module, a case for mounting the battery module, and a cooling system for radiation of the battery module. The battery module is mounted inside the case.
-
US5392873A discloses a structure for securing a plurality of batteries used for an electric vehicle. The battery securing structure includes an inner spacer member having a lower inner spacer member and an upper inner spacer member, each of which is made of a synthetic resin such as polypropylene. The lower inner spacer member has partition portions divided into separate compartments to fixedly dispose each battery in a compartment whereby all the batteries are in a state in which they have been separated from each other on all sides. The upper inner spacer member includes pressing portions for pressing and holding desired portions of the batteries, concave portions for defining spaces used for conductive wires and cooling, and partition portions divided into compartments to unmovably dispose the batteries in a state in which they have been spaced away from each other. Thus, the plurality of batteries can be reliably and firmly secured and fixed within a battery box. -
WO2010064255A1 discloses a battery casing for the battery is provided, wherein battery casing supports electrodes arranged in a desired manner and connected to electrode terminal, wherein battery casing comprises a top closing means and a bottom closing means, characterized in that the bottom closing means comprises a chamber formed by a top covering means and bottom covering means and side covering means, wherein the top covering means of bottom closing means is provided with an opening means for causing transfer of accumulated products from the electrolyte chamber to chamber of bottom closing means, and one of side covering means is provided with another opening means for causing removal of accumulated products from chamber of bottom closing means to the external environment. -
CN107845751A discloses a waterproof box comprising a box body, a box cover, a base plate, a plurality of supporting legs and a liquid drainage nozzle; the cushion plate is fixed on the bottom surface in the box body through the supporting legs; a liquid outlet hole is formed in the side surface of the box body; the liquid drainage nozzle is formed by a square box body and a wedged box body; the box body, the square box body and the wedged box body sequentially communicate with one another; a connection hole of the square box body and the wedged box body is provided with a valve used for sealing the hole; and a knob is connected to the valve. When the waterproof battery box provided by the invention is used, a lithium battery is placed on the cushion plate; when liquid leakage of the lithium battery occurs, leaked liquid flows into a box body space below the cushion plate through a leakage hole, and the lithium battery can be prevented from being soaked in the leaked liquid; and when being overmuch, the liquid in the box body can be drained through the liquid drainage nozzle. -
US9350000B2 -
US4009322A discloses that on the inside of the cover for a storage battery from which liquid is to be drained when the battery is inverted and rocked from side to side upstanding ribs are disposed to concentrate and direct the liquid to the vent openings. Additional ribs may block the flow of liquid past the vent opening in one direction and, in covers where the vent openings are disposed in a recessed channel, a rib may be employed to concentrate and direct liquid over the shoulder formed by the recess when the battery is inverted. -
WO 2012/076808 discloses a sealed, high-voltage battery pack for a hybrid or electric vehicle, comprising a casing containing cells for the production, storage and release of electric energy, and a removable tank containing a moisture absorbing material. The invention is characterized in that it comprises means for maintaining the interior of the casing sealed when the removable tank is removed. -
US 2002/076604 discloses a charging element device comprising a positive electrode terminal and a negative electrode terminal which are located at one end of a cylindrical battery case having a positive electrode and a negative electrode equipped therein and which are respectively connected to the positive electrode and the negative electrode, with an electrolyte solution charging opening being formed at the other end of the battery case. The electrolyte solution charging opening is sealed by a plug having a safety valve, and the safety plug reduces an inner pressure of the battery case when the inner pressure is not less than a predetermined pressure. - The inventors have found that: there might be water accumulated within the case, or there might be a leakage phenomenon in the cooling system inside the case in rainy or other wetted occasions. These conditions are likely to cause short-circuit between the positive and negative electrodes of the battery module.
- The present disclosure proposes a battery pack, for optimizing the structure of the battery pack.
- The embodiments of the present disclosure provide a battery pack, comprising:
- a case, comprising an accommodating cavity and a drain hole in communication with the accommodating cavity; and
- a battery module mounted inside the accommodating cavity;
- wherein a reservoir cavity is provided below the battery module to store a liquid, and in communication with the drain hole.
- The case comprises:
- a first case; and
- a second case enclosing the accommodating cavity with the first case and
- located below the first case; wherein the drain hole is provided in the second case.
- wherein the battery module comprises:
- a battery assembly comprising a plurality of battery cells arranged side by side;
- a cooling system abutting against the plurality of battery cells and configured to cool each of the battery cells;
- wherein the drain hole is configured to discharge a fluid leaked by the cooling system and the volume of the reservoir cavity is greater than or equal to the capacity of the coolant in the cooling system;
- wherein the size of an opening of the drain hole on one end in communication with the accommodating cavity is greater than the size of an opening of the drain hole on the other end in communication with the reservoir portion, or, a film is provided at an end of the drain hole to prevent the backflow.
- In some embodiments, the battery pack further comprises:
- a reservoir portion disposed outside the case;
- wherein the reservoir portion is provided with the reservoir cavity, or the reservoir portion and the case jointly form the reservoir cavity.
- In some embodiments, the reservoir portion is mounted below a wall of the case provided with the drain hole, and sealingly connected with the wall; wherein the reservoir portion and the wall enclose the reservoir cavity.
- In some embodiments, the reservoir portion is provided with an inner concave portion recessed in a direction away from the case.
- In some embodiments, wherein there are a plurality of the drain hole, and the inner concave portion is located outside all of the drain holes and covers all of the drain holes.
- In some embodiments, the battery pack further comprises:
a protection portion mounted on one side of the reservoir portion away from the case. - In some embodiments, the protection portion has a hardness greater than that of the reservoir portion, and the protection portion entirely covers the reservoir portion.
- In some embodiments, the second case comprises:
- a case body; and
- a carrier disposed inside the case body; wherein the carrier divides an inner space of the case into an accommodating cavity and a reservoir cavity; the carrier is provided with the drain hole, and the battery module is carried by the carrier.
- In some embodiments, a bottom of the case body is provided with an inner concave area recessed in a direction away from the first case, and the carrier is connected with an edge of the recessed area.
- In some embodiments, the cooling system comprises:
- at least two cooling plates in which cooling flow passages;
- a connecting pipe in communication with cooling flow passages of each of the cooling plates; and
- wherein the drain hole is adjacent to a connection of the cooling plate and the connecting pipe.
- In some embodiments, all the battery cells of the battery module are arranged along a length direction of the case, and a maximum lateral surface of each of the battery cells and the wall in which the drain hole of the case is located face towards each other.
- In some embodiments, there are a plurality of holes arranged along a width direction of the case.
- In the above-described technical solution, the battery pack has a case and a battery module disposed inside an accommodating cavity of the case. During actual use of the battery pack, there might be liquid inside the accommodating cavity of the case. In order to prevent the liquid from contacting the positive and negative electrodes of the battery module to cause short-circuit in the battery module, in the above-described technical solution, a reservoir portion is provided below the battery module, and in communication with the accommodating cavity of the case via a drain hole, such that the liquid in the accommodating cavity may be discharged into the reservoir cavity via the drain hole.
- The accompanying drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure as well as the illustrations thereof, which are used for explaining the present disclosure, do not constitute improper definitions on the present disclosure. In the accompanying drawings:
-
Fig. 1 is a schematic perspective structural view of a battery pack provided by some embodiments of the present disclosure; -
Fig. 2 is a schematic perspective structural view of a partial structure of a battery pack provided by some embodiments of the present disclosure; -
Fig. 3 is a partially enlarged schematic view of A inFig. 2 ; -
Fig. 4 is a schematic structural view of a battery cell of a battery pack provided by some embodiments of the present disclosure; -
Fig. 5 is a schematic structural view of a laminated electrode assembly; -
Fig. 6 is a schematic structural view of a wound electrode assembly; -
Fig. 7 is a schematic exploded structural view of a partial structure of a battery pack provided by some embodiments of the present disclosure; -
Fig. 8 is a schematic exploded view of members at a second case of the battery pack provided by some embodiments of the present disclosure; -
Fig. 9 is a schematic perspective structural view of a second case of a battery pack provided by some embodiments of the present disclosure; -
Fig. 10 is a schematic partial perspective view at a second case of the battery pack provided by some embodiments of the present disclosure; -
Fig. 11 is a partially enlarged schematic view of B inFig. 10 ; -
Fig. 12 is a schematic partial perspective structural view of a battery pack provided by some embodiments of the present disclosure; -
Fig. 13 is a schematic partial perspective structural view of a battery pack provided by some embodiments of the present disclosure; -
Fig. 14 is a partially enlarged schematic view of D inFig. 13 ; -
Fig. 15 is a schematic partial cross-sectional view along a C direction inFig. 14 ; -
Fig. 16 is a schematic exploded structural view of a carrier, a second case, and a protection portion of a battery pack provided by some embodiments of the present disclosure. - The technical solution provided by the present disclosure will be described in more detail below in conjunction with
Figs. 1 to 16 . - In order to more clearly describe the technical solutions of various embodiments of the present disclosure, a coordinate system is established in
Fig. 1 , and subsequent descriptions of the respective orientations of the battery pack are made based on the coordinate system. Referring toFig. 1 , the X-axis is a length direction of the battery pack. The Y axis is perpendicular to the X axis within a horizontal plane, and the Y axis represents a width direction of the battery pack. The Z axis is perpendicular to a plane formed by the X axis and the Y axis, and the Z axis represents a height direction of the battery module. In the description of the present disclosure, the terms "above" and "below" are both defined relative to the Z-axis direction. The length direction of thecase 1 coincides with that of the battery pack, the width direction of thecase 1 coincides with that of the battery pack, and the height direction of thecase 1 coincides with that of the battery pack. - In the description of the present disclosure, the azimuth or positional relations indicated by the terms "top", "bottom", "within", "outside", which are based on the azimuth or positional relations illustrated by the drawings, are only for facilitating description of the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred thereto has to present a particular azimuth, and be constructed and operated in a particular azimuth, so that it cannot be understood as limiting the protected content of the present disclosure.
- Referring to
Fig. 1, Fig. 1 shows a schematic partial perspective structural view of the battery pack, in which thecase 1 is in an open state. Referring toFig. 2 , one lateral wall of thesecond case 14 of thecase 1 described later is removed inFig. 2 to clearly show the structure of thebattery module 2 inside thecase 1 as well as the positional relationship between thebattery module 2 and thesecond case 14. - Referring to
Figs. 1 to 3 , the embodiments of the present disclosure provide a battery pack, which comprises acase 1 and abattery module 2. Thecase 1 comprises anaccommodating cavity 11 and adrain hole 12 in communication with theaccommodating cavity 11. Thebattery module 2 is mounted inside theaccommodating cavity 11. Wherein, areservoir cavity 10 for storing a liquid is provided below thebattery module 2, and in communication with thedrain hole 12. The term "below" mentioned here is immediately below or obliquely below, so that the liquid inside theaccommodating cavity 11 flows through thedrain hole 12 into thereservoir cavity 10 under the effect of gravity. - The
reservoir cavity 10 is for example located inside the case, or thereservoir cavity 10 is outside thecase 1, or part of thereservoir cavity 10 is inside the case and the other part of thereservoir cavity 10 is outside the case. Specifically, there are three positions for providing the reservoir cavity 10: the first is that thereservoir cavity 10 is completely located inside thecase 1; the second is that thereservoir cavity 10 is completely located outside thecase 1; the third is that thereservoir cavity 10 has one part located inside thecase 1 and the other part located outside thecase 1. The various implementations will be described specifically later. - In the above-described technical solution, the battery pack is provided with a
reservoir cavity 10, which is located below a gravity direction of thebattery module 2. When there is liquid accumulated within theaccommodating cavity 11, the accumulated liquid flows downward under the effect of gravity, to thedrain hole 12, and into thereservoir cavity 10 via thedrain hole 12 for storage. In the above-described technical solution, since thereservoir cavity 10 is disposed below thebattery module 2, the short-circuit phenomenon of thebattery module 2 caused by the fluid within theaccommodating cavity 11 is reduced or even avoided, thereby improving the operational reliability of the battery pack. Moreover, the above-described technical solution is not limited by a placing height of thebattery module 2, and in the case of a low height of thebattery module 2 and a low position of the electrode terminal thereof, the short-circuit risk of thebattery module 2 is reduced, thereby improving the operational reliability of the battery pack. - Next, the respective constituent parts of the battery pack will be introduced in detail with reference to the accompanying drawings.
- First, the implementation of the
case 1 will be introduced. - Referring to
Figs. 1 to 3 , in some embodiments, thecase 1 comprises afirst case 13 and asecond case 14. Thesecond case 14 and thefirst case 13 enclose anaccommodating cavity 11, and thesecond case 14 is located below thefirst case 13. Thedrain hole 12 is provided in thesecond case 14. - The
first case 13 and thesecond case 14 are locked together to form the above-describedaccommodating cavity 11. In some embodiments thefirst case 13 and thesecond case 14 use other detachable connection means such as bolt connection. For example, thecase 1 is formed by a mosaic of two case halves, which on the one hand facilitates mounting, replacing, repairing and servicing various members within theaccommodating cavity 11 of thecase 1, and on the other hand also makes it easier to manufacture and machine thecase 1. Moreover, thecase 1 has a regular structure, so that the battery pack is conveniently mounted to the vehicle. - Referring to
Fig. 1 , thecase 1 is configured to mount thebattery module 2. Thecase 1 and thebattery module 2 are detachably connected therebetween, for example, a connecting frame is mounted on the inner wall of thecase 1, and a connecting member is disposed on thebattery module 2, such that the connecting frame and the connecting member are detachably connected by bolts or the like. By using the above-described implementation, the connection between thebattery module 2 and thecase 1 is stable and reliable, so that the battery pack has a reliable structure. - Referring to
Fig. 1 , thedrain hole 12 described above is provided at the bottom of thesecond case 14. When there is liquid accumulated inside theaccommodating cavity 11, the fluid within theaccommodating cavity 11 automatically flows out of theaccommodating cavity 11 via thedrain hole 12 under the effect of self-gravity, thereby effectuating automatic draining of the liquid accumulated within theaccommodating cavity 11. - Referring to
Figs. 1 to 7 , the relevant content of thebattery module 2 will be introduced below. - The
battery module 2 comprises abattery cell assembly 21 and acooling system 22. Thebattery cell assembly 21 comprises a plurality ofbattery cells 210 arranged side by side. The plurality ofbattery cells 210 are electrically connected to each other. Thecooling system 22 is configured to cool thebattery cell assembly 21 of thebattery module 2. Thecooling system 22 is filled with a fluid for cooling. There might be a leakage phenomenon at the connection of various members of thecooling system 22. Thedrain hole 12 is configured to discharge the fluid leaked by thecooling system 22, so that there is seldom or even no liquid accumulated inside thecase 1, thereby reducing or even eliminating the short-circuit risk of the battery pack. - Referring to
Figs. 1 and7 , thebattery module 2 comprises a plurality ofbattery cell assemblies 21, which are provided to be connected in series, in parallel or both for the electrical connection manner, so as to realize the electrical properties required for the battery pack. - Referring to
Figs. 4 to 6 , the structure of thebattery cell 210 will be described below. - Referring to
Fig. 4 , thebattery cell 210 comprises ahousing 211, anelectrode assembly 212 disposed within thehousing 211, a connectingmember 213 disposed at an end of theelectrode assembly 212, and acover place 214 covering the connectingmember 213 and the end ofelectrode assembly 212. Thecover plate 214 is provided with anelectrode terminal 215. - The
housing 211 is closed at one end and open at the other end. Thecover plate 214 is disposed at an opening of thehousing 211. Theelectrode assembly 212 is mounted to an interior of thehousing 211 via the opening. The maximum lateral surface of theelectrode assembly 212 and that of thehousing 211 face towards each other, and the maximum lateral surface of thehousing 211 serves as the maximum lateral surface A of the battery cell. - The manufacturing manner of the
electrode assembly 212 comprises a laminated manner and a wound manner. As shown inFig. 5 , thelaminated electrode assembly 212 is to tailor thepositive electrode tab 216, thenegative electrode tab 217, and thediaphragm 218 into a size having a specified dimension, and subsequently laminate thepositive electrode tab 216, thediaphragm 218, and thenegative electrode tab 217 into theelectrode assembly 212. As shown inFig. 6 , thewound electrode assembly 212 is to wind thepositive electrode tab 216, thenegative electrode tab 217, and thediaphragm 218 to form a shape. - The maximum surface of the
laminated electrode assembly 212 and thewound electrode assembly 212 is the surface having the largest expansion ratio. Thebattery cell 210 introduced later is laid flat. As shown inFigs. 1 and 2 , the placing manner effectively reduces the accumulated expansion of thebattery cell assembly 21 and further reduces the accumulated expansion of the battery pack since the maximum expansion surface of thebattery cell 210 is along the Z-axis direction, and the dimension of thebattery module 2 along the Z-axis direction is smaller than the dimension along the X-axis or the Y-axis direction. - Referring to
Figs. 1, 2 and7 , the arrangement manners of therespective battery cells 210 of thebattery cell assembly 21 will be introduced below. - With reference to
Figs. 1, 2 and7 , a plurality ofbattery cells 210 are arranged along a length direction of thecase 1, and a maximum lateral surface of each of thebattery cells 210 and thewall 15 in which thedrain hole 12 of thecase 1 is located face towards each other. - Taking the coordinate system shown in
Fig. 1 for example. A plurality ofbattery cells 210 are arranged flat along the length direction X of thecase 1. That is, the maximum lateral surface A of thebattery cell 210 is substantially parallel to the length direction X of thecase 1, and the maximum lateral surface A of thebattery cell 210 and thewall 15 of thecase 1 face towards each other. - As shown in
Fig. 1 , two rows ofbattery cell assemblies 21 are provided along a width direction (i.e., the Y-axis direction) of the battery pack. In actual application, three rows or more are provided. In actual use, one or more layers of battery cell assemblies 21are provided in the height direction of the battery pack, that is, in the Z-axis direction inFig. 1 . - The placing manner in which the maximum lateral surface A of the
battery cell 210 and thewall 15 of thecase 1 face towards each other is also referred to be laid flat. By using such an arrangement manner as to be laid flat, since thebattery cell assembly 21 has a relatively short height in the Z direction, to reduce the overall height of the battery pack, the battery pack having such structure is more suitable for a vehicle having a relatively short space for mounting the battery pack. However, since thebattery cell assembly 21 has a short height, the bus bar of thebattery cell 210 is also in a low position, and theelectrode terminal 215 is relatively closer to the bottom of thecase 1. If the structure of the embodiments of the present disclosure is not employed, when there is leakage in thecooling system 22 inside thecase 1 or liquid accumulated within thecase 1, thebattery cell 210 that is laid flat is more likely to be subjected to a short-circuited phenomenon. - If the above-described structure of the embodiments of the present disclosure is employed, the above-described two problems can be favorably balanced, so that the battery pack may have a relatively short height to meet the vehicle installation requirements; and also the battery pack is less likely to be subjected to a short-circuited phenomenon inside, thereby improving the performance of the battery pack. Since the battery pack has the
reservoir portion 3 in communication with theaccommodating cavity 11 via thedrain hole 12, and the liquid accumulated within theaccommodating cavity 11 readily flow out of theaccommodating cavity 11 through thedrain hole 12, thereby effectively reducing a possibility of a water accumulation phenomenon within thecase 1, reducing and even avoiding a possibility of a short-circuit phenomenon in the battery module, and improving the performance and structure of the battery pack. - In addition, by using the above-described arrangement manner, each of the
battery cells 210 of thebattery module 2 is laid flat. Since the maximum expansion surface of each of thebattery cells 210 comprised in thebattery cell assembly 21 is along the Z-axis direction, there is less accumulated expansion of each of thebattery cells 210, thereby optimizing the performance of the battery pack. - Referring to
Figs. 1 to 4 , the relevant content of thecooling system 22 of thebattery module 2 will be introduced below. - The
cooling system 22 is disposed outside thebattery cell assembly 21, and configured to cool thebattery cell assembly 21. Alternatively, thecooling system 22 cools the bottom surface of thebattery cell assembly 21. The bottom surface of thebattery cell assembly 21 refers to a surface of each of thebattery cells 210 comprised in thebattery cell assembly 21 facing the top surface provided with theelectrode terminal 215. - Referring to
Figs. 1 and 2 , in some embodiments, two rows ofbattery cell assemblies 21 share a set of coolingsystem 22. As shown inFig. 1 , the top surfaces of the two rows ofbattery cell assemblies 21 provided with theelectrode terminals 215 are opposite to each other, and thecooling system 22 is configured to simultaneously cool the bottom surfaces of the two rows of battery cells. Alternatively, the top surfaces of the two rows of battery cells provided with theelectrode terminals 215 are away from each other. The bottom surfaces of each of thebattery cells 210 of the two rows ofbattery cell assemblies 21 are arranged oppositely, with a gap between the two rows ofbattery cell assemblies 21, and thecooling plate 221 of thecooling system 22 is disposed at the gap to simultaneously cool the bottom surfaces of the two rows ofbattery cell assemblies 21. - Referring to
Figs. 1 to 3 , to continue with the above-described, in some embodiments, thecooling system 22 comprises acooling plate 221 and a connectingpipe 222. The coolingplates 21 are internally provided with cooling flow passages (not shown in the drawings), and have a number of two or more. The coolingplates 221 have a number of two or more. The connectingpipe 222 is connected to the cooling flow passage to connect therespective cooling plates 221. Wherein, thedrain hole 12 is adjacent to a connection of thecooling plate 221 and the connectingpipe 222. Adjacent means that thedrain hole 12 is relatively close to the connection between the coolingplate 221 and theconnection pipe 222, so that the liquid leaking from the connection between the coolingplate 221 and theconnection pipe 222 easily flow into thedrain hole 12. - In some embodiments, a feeding pipe and a draining pipe may be additionally provided outside the
case 1, and thecooling system 22 is in communication with both the feeding pipe and the draining pipe. The structure realizes the circulation of a coolant inside thecooling system 22, so that there is a favorable cooling effect of the battery pack. - Referring to
Figs. 1 and3 , thecooling system 22 comprises two connectingpipes 222, which are respectively located on both sides of thebattery module 2 in a length direction. One or more rows of drain holes 12 are provided below a connection position of each of the connectingpipes 222 and thecooling plate 221. If there is leakage at the connection between the connectingpipe 222 and thecooling plate 221, thedrain hole 12 readily drain the accumulated liquid to ensure normal use of thebattery module 2 inside thecase 1. - Referring to
Figs. 1 to 4 , thecooling system 22 is disposed between the two end surfaces of thebattery cell assembly 21, as shown inFig. 1 , that is, one of the two coolingplates 221 of thecooling system 22 cools the bottom surface of onebattery cell assembly 21, and theother cooling plate 221 cools the bottom surface of the otherbattery cell assembly 21. The above-described arrangement implements using one set of coolingsystem 22, and simultaneously cooling the twobattery cell assemblies 21, thereby reducing the number of the cooling members and making a lightweight structure of the battery pack. - Referring to
Figs. 1 to 3 andFigs. 7 to 11 , the relevant content of thedrain hole 12 will be further introduced in detail below. - The
battery module 2 is integrally mounted to one of the walls of thecase 1, which is referred to as awall 15. Thedrain hole 12 is also disposed in thewall 15 of thecase 1. Taking the direction shown inFig. 1 as an example, thewall 15 is the bottom wall of thecase 1. Further, thedrain hole 12 is located below a gravity direction of thebattery module 2. - Taking the direction shown in
Fig. 1 as an example, thedrain hole 12 is disposed at the bottom of thecase 1, so that the liquid directly flows towards thedrain hole 12 under the effect of gravity and then into thereservoir cavity 10 when there is leakage in thecooling system 22 inside thecase 1 described later. The flow path of the liquid is illustrated by the path M inFig. 3 . - Referring to
Figs. 1 and7 , in some embodiments, the drain holes 12 are arranged in rows in thewall 15 of thecase 1, and the drain holes 12 penetrate through thewall 15. - The
drain hole 12 is, for example, a circular hole, a trapezoidal hole, an irregular hole, or the like. The shape of thedrain hole 12 is not limited, with a function of enabling the accumulated liquid to pass through and smoothly flow into thereservoir cavity 10. Thedrain hole 12 having a circular hole shape is used to facilitate the machining and manufacturing. Thedrain hole 12 having a trapezoidal hole is used, and the dimension at one end of thedrain hole 12 in communication with theaccommodating cavity 11 is greater than the dimension at the other end of thedrain hole 12 in communication with thereservoir cavity 10. The structure effectively reduces a possibility of backflow of fluid within thereservoir cavity 10. Thedrain hole 12 having an irregular hole is used to implement randomly designing the structure, shape and dimension of thedrain hole 12, so as to satisfy the personalized communicating requirements. - In some embodiments, the
drain hole 12 is configured to allow liquid to flow unidirectionally from thedrain hole 12 to thereservoir cavity 10. Alternatively, thedrain hole 12 is provided with a direction regulating member that allows liquid to flow unidirectionally from thedrain hole 12 to thereservoir portion 3. - The drain hole has a dimension at one end greater than the dimension at the other end, or a film that prevents the backflow is provided at an end of the
drain hole 12 to prevent the backflow. - In some embodiments, the dimension of the opening at one end of the
drain hole 12 in communication with theaccommodating cavity 11 is greater than the dimension of the opening at the other end in communication with thereservoir cavity 10. The end having a larger dimension is located upstream of the gravity direction, and the end having a smaller dimension is located downstream of the gravity direction. This structure makes it difficult for the liquid to flow back into thecase 1 via thedrain hole 12 when thecase 1 is inverted. - By the above-described arrangement, after the liquid accumulated within the
accommodating cavity 11 of thecase 1 flows out into thereservoir cavity 10 via thedrain hole 12, the fluid in thereservoir cavity 10 is also less likely to turn around into theaccommodating cavity 11 during the use of the battery pack even if there are accidental conditions such as collision and impact, thereby reducing the short-circuit of thebattery module 2 resulting from the backflow of the fluid in thereservoir cavity 10 to theaccommodating cavity 11, optimizing the structure of the battery pack, and improving the performance of the battery pack. - Next, referring to
Fig. 1 , multiple implementations of thereservoir cavity 10 will be introduced. - Divided according to the position of the
reservoir cavity 10, thereservoir cavity 10 may be located inside or outside thecase 1, or partially inside thecase 1 and partially outside thecase 1. - The implementation of the
reservoir cavity 10 located outside thecase 1 will first be introduced below. - In the embodiments shown in
Fig. 1 , the battery pack further comprises areservoir portion 3. Thereservoir portion 3 is disposed outside thecase 1. Thereservoir portion 3 is separately provided with thereservoir cavity 10, or thereservoir portion 3 and thecase 1 jointly form thereservoir cavity 10. - Referring to
Fig. 1 , thereservoir portion 3 is located outside the bottom of thecase 1, and thereservoir portion 3 and the bottom wall of thecase 1 are fixed together. - If the
reservoir portion 3 is separately provided with thereservoir cavity 10, thereservoir portion 3 and thecase 1 are also sealingly connected therebetween, so that thereservoir cavity 10 communicates with thedrain hole 12, and there is no fluid leakage from the connection between thereservoir portion 3 and thecase 1. The manner of implementing sealingly connecting thereservoir portion 3 and thecase 1 is for example in a way such that both of them are sealingly connected directly, or for example to implement a sealed connection by providing the sealing structures that are mated with each other. Alternatively, a sealing member is sandwiched between thereservoir portion 3 and thecase 1, such that thereservoir portion 3 is sealingly connected to thecase 1 by the sealing member. - When the
reservoir portion 3 and thecase 1 jointly form thereservoir cavity 10, thereservoir portion 3 and thecase 1 are also sealingly connected. There are multiple sealed connection manners. One alternative manner is that thereservoir portion 3 is sealingly connected to thecase 1 directly. Another manner is that a sealing member is sandwiched between thereservoir portion 3 and thecase 1, such that thereservoir portion 3 is sealingly connected to thecase 1 by the sealing member. The sealing member is, for example, a sealing ring or the like. In the above-described implementation, thereservoir portion 3 is sealingly connected to thecase 1, so that the liquid within theaccommodating cavity 11 does not leak via the connection between thereservoir portion 3 and thecase 1, thereby improving the performance of the battery pack. - As known from the above-described introduction, when located outside the
case 1, there are two manners for thereservoir portion 3 to form the reservoir cavity 10: - The first is that the
reservoir portion 3 itself has a structure of a closed cavity which has an inflow port in communication with thedrain hole 12. The closed cavity serves as thereservoir cavity 10. In the above-described technical solution, thereservoir portion 3 is a separate member, and separately forms thereservoir cavity 10. At the time of installation, thereservoir portion 3 is sealingly fixed to thecase 1, such that thereservoir cavity 10 communicates with thedrain hole 12 to prevent leakage of liquid from thedrain hole 12 to an area other than thereservoir cavity 10. - The second implementation is that: the
reservoir portion 3 and thecase 1 jointly form thereservoir cavity 10. - Referring to
Figs. 1 and11 , in some embodiments, thereservoir portion 3 is mounted outside thewall 15 of thecase 1 provided with thedrain hole 12, and sealingly connected to thewall 15. Wherein, thereservoir portion 3 and the outside of thewall 15 enclose thereservoir cavity 10. - If the
reservoir portion 3 and thewall 15 jointly form thereservoir cavity 10, the sealed connection manner of thereservoir portion 3 and thewall 15 is similar to the sealed connection method introduced above, and thus will not be described in detail here. In the above-described implementation, thereservoir portion 3 is sealingly connected to thewall 15, so that the liquid within theaccommodating cavity 11 does not leak via the connection between thereservoir portion 3 and thewall 15, thereby improving the performance of the battery pack. - Specifically, referring to
Figs. 1 ,8 and11 , thereservoir portion 3 is provided with an innerconcave portion 31, which encloses thereservoir cavity 10 with thewall 15. - In some embodiments, the inner
concave portion 31 is for example plural, and a plurality of innerconcave portions 31 jointly cover all of the drain holes 12. - Alternatively, in some embodiments, the inner
concave portions 31 are located outside all of the drain holes 12. That is, the innerconcave portions 31 completely cover all of the drain holes 12, so that the liquid within thedrain hole 12 completely flows to thereservoir cavity 10. - The inner
concave portion 31 provided in one of thereservoir portions 3 is, for example, plural, and a plurality of innerconcave portions 31 of thesame reservoir portion 3 are in communication or not in communication. - In some embodiments, the material of the
reservoir portion 3 comprises plastic. The plastic material which has a favorable deformation property, effectively absorb energy, and reduce a possibility of a sealing failure when subjected to a collision. - In embodiments of the invention, the volume of the
reservoir cavity 10 is greater than or equal to the capacity of the coolant in thecooling system 22. At the condition of a very serious leakage in thecooling system 22, thebattery module 2 will not be soaked in the liquid as well, thereby enhancing the operational reliability of the battery pack - Referring to
Figs. 1 to 9 , in some embodiments, thereservoir portion 3 further comprises aprotection portion 4 mounted on one side of thereservoir portion 3 away from the outside surface. - The
protection portion 4 is, for example, a plate-like structure provided with an inner concave structure mated with the innerconcave portion 31 of thereservoir portion 3, so as to completely wrap the outside of thereservoir portion 3, thereby reducing a possibility of failure of thereservoir portion 3 due to collision. - The
protection portion 4 is configured to protect thereservoir portion 3, to prevent that thereservoir portion 3 is deformed and damaged due to collision. - In some embodiments, the
protection portion 4 has a strength higher than that of thereservoir portion 3. Theprotection portion 4 entirely covers thereservoir portion 3. - Next, referring to
Figs. 12 to 16 , some specific implementations of thereservoir cavity 10 formed inside thecase 1 will be described. - Referring to
Figs. 12 and13 , thecase 1 comprises acase body 141 and acarrier 142 disposed inside thecase body 141. Thecarrier 142 divides the internal space of thecase 1 into theaccommodating cavity 11 and thereservoir cavity 10. Thecarrier 142 is provided with adrain hole 12, and thebattery module 2 is mounted on thecarrier 142. - The
carrier 142 is, for example, flat shaped. Thecarrier 142 is welded or bolted to the inner wall of thecase 1. The above-described structure makes a more compact and lightweight structure of the battery pack. - The functions of the
accommodating cavity 11 and thereservoir cavity 10 are the same as those introduced above. Theaccommodating cavity 11 is configured to mount thebattery module 2. Thereservoir cavity 10 is configured to store fluid leaking from theaccommodating cavity 11. Please refer to the above-described for other content. - Referring to
Figs. 12 ,13 , and16 , the bottom of thecase 1 is provided with an innerconcave area 16, and thecarrier 142 is mounted at an edge of the innerconcave area 16. The innerconcave area 16 is a part of thecase 1. The above-described arrangement is used to simplify the machining, and make a stable and reliable structure of thereservoir cavity 10. - Referring to
Fig. 12 , the exterior of thereservoir cavity 10 is provided with aprotection portion 4 for covering the outer wall of thereservoir cavity 10. - The
protection portion 4 for example has a strength higher than that of the outer wall of thereservoir cavity 10. Theprotection portion 4 is configured to protect the outer wall of thereservoir cavity 10 to reduce a possibility of a leakage risk of thereservoir cavity 10 in the event of a collision or the like, and to ensure normal use of the battery pack. - It may be understood that, in the above-described various embodiments, as long as they are not contradictory, it is possible to refer to or combine the relevant content of the remaining embodiments, so as to implement that the
reservoir cavity 10 is partially located inside thecase 1 and partially located outside thecase 1.
Claims (12)
- A battery pack, comprising:a case (1), comprising an accommodating cavity (11) and a drain hole (12) in communication with the accommodating cavity (11); anda battery module (2) mounted inside the accommodating cavity (11);wherein a reservoir cavity (10) is provided below the battery module (2) to store a liquid, and in communication with the drain hole (12);wherein the case (1) comprises:a first case (13); anda second case (14) enclosing the accommodating cavity (11) with the first case (13) and located below the first case (13); wherein the drain hole (12) is provided in the second case (14);wherein the battery module (2) comprises:a battery cell assembly (21) comprising a plurality of battery cells (210) arranged side by side;a cooling system (22) abutting against the plurality of battery cells (210) and configured to cool each of the battery cells (210); andwherein the drain hole (12) is configured to discharge a fluid leaked by the cooling system (22); the volume of the reservoir cavity (10) is greater than or equal to the capacity of the coolant in the cooling system (22);wherein the size of an opening of the drain hole (12) on one end in communication with the accommodating cavity (11) is greater than the size of an opening of the drain hole (12) on the other end in communication with the reservoir portion (3), or, a film is provided at an end of the drain hole (12) to prevent the backflow.
- The battery pack according to claim 1, further comprising:a reservoir portion (3) disposed outside the case (1);wherein the reservoir portion (3) is provided with the reservoir cavity (10), or the reservoir portion (3) and the case (1) jointly form the reservoir cavity (10).
- The battery pack according to claim 2, wherein the reservoir portion (3) is mounted below a wall (15) of the case (1) provided with the drain hole (12), and sealingly connected with the wall (15); wherein the reservoir portion (3) and the wall (15) enclose the reservoir cavity (10).
- The battery pack according to claim 3, wherein the reservoir portion (3) is provided with an inner concave portion (31) recessed in a direction away from the case (1).
- The battery pack according to claim 4, wherein there are a plurality of the drain hole (12), and the inner concave portion (31) is located outside all of the drain holes (12) and covers all of the drain holes (12).
- The battery pack according to any one of claims 2 to 5, further comprising:
a protection portion (4) mounted on one side of the reservoir portion (3) away from the case (1). - The battery pack according to claim 6, wherein the protection portion (4) has a hardness greater than that of the reservoir portion (3), and the protection portion (4) entirely covers the reservoir portion (3).
- The battery pack according to claim 1, wherein the second case (14) comprises:a case body (141); anda carrier (142) disposed inside the case body (141); wherein the carrier (142) divides an inner space of the case (1) into the accommodating cavity (11) and the reservoir cavity (10); the carrier (142) is provided with the drain hole (12), and the battery module (2) is carried by the carrier (142).
- The battery pack according to claim 8, wherein a bottom of the case body (141) is provided with an inner concave area (16) recessed in a direction away from the first case (13), and the carrier (142) is connected with an edge of the recessed area (16).
- The battery pack according to claim 9, wherein the cooling system (22) comprises:at least two cooling plates (221), wherein each of the at least two cooling plates (221) is provided in cooling flow passages;a connecting pipe (222) in communication with the cooling flow passages of each of the at least two cooling plates (221); andwherein the drain hole (12) is adjacent to a connection of the cooling plate (221) and the connecting pipe (222).
- The battery pack according to any one of claims 1 to 10, wherein all of the battery cells (210) of the battery module (2) are arranged along a length direction of the case (1), and a maximum lateral surface of each of the battery cells (210) and the wall (15) in which the drain hole (12) of the case (1) is located face towards each other.
- The battery pack according to any one of claims 1 to 11, wherein there are a plurality of the drain holes (12) arranged along a width direction of the case (1).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910603742.6A CN112259937A (en) | 2019-07-05 | 2019-07-05 | Battery pack |
Publications (2)
Publication Number | Publication Date |
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EP3761388A1 EP3761388A1 (en) | 2021-01-06 |
EP3761388B1 true EP3761388B1 (en) | 2022-07-13 |
Family
ID=70008299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20165540.4A Active EP3761388B1 (en) | 2019-07-05 | 2020-03-25 | Battery pack |
Country Status (5)
Country | Link |
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US (1) | US11611116B2 (en) |
EP (1) | EP3761388B1 (en) |
JP (1) | JP6891238B2 (en) |
CN (1) | CN112259937A (en) |
WO (1) | WO2021004230A1 (en) |
Families Citing this family (3)
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CN113509661A (en) * | 2021-06-25 | 2021-10-19 | 国网山东省电力公司梁山县供电公司 | Storage and control integrated lithium battery and electric vehicle with fireproof protection function |
KR20230038775A (en) | 2021-07-30 | 2023-03-21 | 컨템포러리 엠퍼렉스 테크놀로지 씨오., 리미티드 | Batteries, electrical equipment, manufacturing methods and equipment for batteries |
EP4152512A4 (en) * | 2021-07-30 | 2023-11-08 | Contemporary Amperex Technology Co., Limited | Battery, electrical device and method for preparing battery |
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2020
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Also Published As
Publication number | Publication date |
---|---|
JP6891238B2 (en) | 2021-06-18 |
WO2021004230A1 (en) | 2021-01-14 |
US11611116B2 (en) | 2023-03-21 |
JP2021012864A (en) | 2021-02-04 |
US20210005941A1 (en) | 2021-01-07 |
CN112259937A (en) | 2021-01-22 |
EP3761388A1 (en) | 2021-01-06 |
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